The objective here is very simple. You think of what units you want to be able to create, determine what you might need, give them some fluff (story, decription, and other details), and then you post them.
Given the size of the information for some units may become, try to limit 1 unit per post.
If you have any thoughts on how you would make units differently than what has already been mentioned, feel free to post them as well. For instance, do you think that some units might need certian rituals (to produce long lasting magical results) to be cast before a unit is made? Do you think think that some units need to learn/train certain skill or spells before they are ready to be used?
With any luck, the devs will be inspired by our units and will seek ways to ensure that we can make them.